HESI A2 CHEMISTRY & BIOLOGY EXAM QUESTIONS WITH CORRECT VERIFIED ANSWERS | 100% PASS (A+ CERTIFIED)

Hierarchic System of Organization? Correct Answer Kingdom, Phylum, Class, Order, Family, Genus, Species Core theme of biology? Correct Answer Evolution Most significant aspect of water? Correct Answer The polarity of its bonds What allows for hydrogen bonding between molecules? Correct Answer Polar nature of water What is specific heat? Correct Answer Amount of heat necessary to the raise the temp. of 1 gram of that molecule by 1 degree celsius. What is cohesion? Correct Answer Ability of a molecule to stay bonded or attracted to another molecule of the same substance. What is adhesion? Correct Answer Ability of water to bond to or attract other molecules or substances. What is a lattice? Correct Answer The spreading apart of molecules when they freeze. Causes the phenomenon of floating. 4 most important molecules to biology? Correct Answer Carbohydrates, Lipids, Proteins, Nucleic Acids Structure of Carbs? Correct Answer Long chains AKA polymers Most important purposes of Carbs? Correct Answer Storage, Structure, Energy Specific types of Lipids? Correct Answer Fatty Acids, Phospholipids, Steroids Two categories of fatty acids? Correct Answer Saturated and unsaturated Difference between saturated and unsaturated structurally? Correct Answer Saturated have no double bonds unsaturated have one or more double bonds. State of saturated fats and unsaturated fats at room temp? Correct Answer sat-Solid unsat- Liquid Structure of phospholipids? Correct Answer Two fatty acids and a phosphate group. Importance of the way phospholipids form? Correct Answer Create barrier to protect the cell. Importance of steroids? Correct Answer Precursor to many significant hormones. What are the most significant contributors to cellular function? Correct Answer Proteins What are amino acids? Correct Answer 20 molecules creating a polymer called protein. What is the largest of the biological molecules? Correct Answer Proteins.